The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 1977
Filed:
Oct. 06, 1975
Applicant:
Inventors:
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
318685 ; 318696 ; 310 / ;
Abstract
An improved method and apparatus for determining the speed and position values of a stepping motor for controlling or regulating the same. These values are derived from induced voltages within the bifilar windings of the stepping motor combined with voltages across and currents through the same bifilar windings. The speed values are derived from the amplitude of the induced voltages and the position values are derived from the zero transitions of the induced voltages. A desirable advance of the motor is distinguished from an undesirable oscillation of the motor by determining whether the induced voltages in the bifilar windings become zero simultaneously.